Sharpstar 0.85X MPCC 3" Coma Reducer Corrector #CRC3085

$499.00
Article number: CRC3085
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The Newtonian reflecting system has always been a favorite model for astronomy enthusiasts, and it is also one of the relatively easy-to-understand and used telescope systems. The visual Newtonian system is relatively simple, but for photo use, the coma corrector is recommended to eliminate inherent coma for optimized imaging performance.
SHARPSTAR 30085NTRD coma reduction corrector is the result! It features a 3" specification, 0.85x focal reduction, full-frame photography is supported, and achieves outstanding quality performance. 
Acts as a 0.85x reducer so a F4 Newtonian becomes F3.4 full-frame photography. In addition, the rich thread adapter allows attach many photography accessories, the front side has M82X1 male thread to connect our new 3" focuser, or other brands of connection equipment with corresponding thread. The rear side has M76X1 male thread and M68X1 female thread and (standard 55MM back focus achieved) M54X0.75 male thread, can be attached to our M54-M48 dual-use camera adapter ring.
The reducer offers flat-field performance in the edge image, and provides effective correction for chromatic aberration, is an indispensable accessory for Newtonian photography.
Suitable model:200mm-800mm paraboloid reflector
Focal ratio range: F3-F6
Magnification: 0.85x
Fully illuminated image circle: 44mm
Lens amount: Quadruplet
Outer diameter: Φ75mm
Focal plane: 55mm (from 54mm x 0.75mm thread side)
Total length: 119.8mm
Surface coating: fully multi-coated optics
Weight: 0.85kg

Performance of 30085NTRD in Newtonian reflector(D200 F3.5)
Performance of 30085NTRD in Newtonian reflector(D200 F4)
Performance of 30085NTRD in Newtonian reflector(D200 F5)
Performance of 30085NTRD in Newtonian reflector(D300 F3.5)
Performance of 30085NTRD in Newtonian reflector(D300 F4)
Performance of 30085NTRD in Newtonian reflector(D300 F5)
Optical path diagram of 30085NTRD
 
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